TY  - JOUR
AU  - P. V. Sokolov
TI  - A geometric picture of the integral surfaces near a singular integral element of a first order partial differential equation
JO  - Differencialʹnye uravneniâ
PY  - 1971
SP  - 2225
EP  - 2233
VL  - 7
IS  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1971_7_12_a11/
LA  - ru
ID  - DE_1971_7_12_a11
ER  -